U.S. patent application number 16/756253 was filed with the patent office on 2021-06-24 for imaging element-mounting board.
This patent application is currently assigned to NITTO DENKO CORPORATION. The applicant listed for this patent is NITTO DENKO CORPORATION. Invention is credited to Masaki ITO, Yoshihiro KAWAMURA, Shusaku SHIBATA, Hayato TAKAKURA, Shuichi WAKAKI.
Application Number | 20210195070 16/756253 |
Document ID | / |
Family ID | 1000005473702 |
Filed Date | 2021-06-24 |
United States Patent
Application |
20210195070 |
Kind Code |
A1 |
SHIBATA; Shusaku ; et
al. |
June 24, 2021 |
IMAGING ELEMENT-MOUNTING BOARD
Abstract
An imaging element-mounting board includes a board area having a
board disposed and a plurality of reinforcement portions disposed
around the board area. The plurality of reinforcement portions are
independent from each other.
Inventors: |
SHIBATA; Shusaku; (Osaka,
JP) ; TAKAKURA; Hayato; (Osaka, JP) ;
KAWAMURA; Yoshihiro; (Osaka, JP) ; ITO; Masaki;
(Osaka, JP) ; WAKAKI; Shuichi; (Osaka,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NITTO DENKO CORPORATION |
Osaka |
|
JP |
|
|
Assignee: |
NITTO DENKO CORPORATION
Osaka
JP
|
Family ID: |
1000005473702 |
Appl. No.: |
16/756253 |
Filed: |
October 2, 2018 |
PCT Filed: |
October 2, 2018 |
PCT NO: |
PCT/JP2018/036759 |
371 Date: |
April 15, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04N 5/369 20130101;
H01L 27/14636 20130101; H04N 5/2253 20130101 |
International
Class: |
H04N 5/225 20060101
H04N005/225; H04N 5/369 20060101 H04N005/369; H01L 27/146 20060101
H01L027/146 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 26, 2017 |
JP |
2017-207237 |
Claims
1. An imaging element-mounting board comprising: a board area
having a board disposed and a plurality of reinforcement portions
disposed around the board area, wherein the plurality of
reinforcement portions are independent from each other.
2. The imaging element-mounting board according to claim 1, wherein
the plurality of reinforcement portions include the reinforcement
portions facing each other with the board area sandwiched
therebetween in a plane direction perpendicular to a thickness
direction.
3. The imaging element-mounting board according to claim 1, wherein
the board area is a plural board area in which the plurality of
boards are disposed in alignment in a plane direction perpendicular
to a thickness direction.
4. The imaging element-mounting board according to claim 3, wherein
the plural board area has a generally rectangular shape, and the
plurality of reinforcement portions are disposed corresponding to
each of the sides of the plural board area.
5. The imaging element-mounting board according to claim 3 further
comprising: an auxiliary reinforcement portion disposed at the
inside of the plural board area.
6. The imaging element-mounting board according to claim 1, wherein
the board area is a singular board area in which the single number
of board is disposed.
7. The imaging element-mounting board according to claim 6, wherein
the singular board area has a generally rectangular shape, and the
plurality of reinforcement portions are disposed corresponding to
each of the sides of the singular board area.
8. The imaging element-mounting board according to claim 4, wherein
each of the plurality of reinforcement portions has a generally
linear shape, the plurality of reinforcement portions are disposed
so that a phantom line passing each of the plurality of
reinforcement portion has an intersection point, and the
reinforcement portion is not formed in a portion corresponding to
the intersection point.
9. The imaging element-mounting board according to claim 1, wherein
a material for the plurality of reinforcement portions is a metal,
and the board area includes a resin film.
10. The imaging element-mounting hoard according to claim 1,
wherein the board area has a thickness of 50 .mu.m or less.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a 35 U.S.C. 371 National Stage
Entry of PCT/JP2018/036759, filed on Oct. 2, 2018, which claims
priority from Japanese Patent Application No. 2017-207237, filed on
Oct. 26, 2017, the contents of all of which are herein incorporated
by reference in their entirety.
TECHNICAL FIELD
[0002] The present invention relates to an imaging element-mounting
board.
BACKGROUND ART
[0003] Conventionally, a semiconductor-mounting board for an
imaging device for mounting a semiconductor for imaging has been
known.
CITATION LIST
Patent Document
[0004] Patent Document 1: Japanese Unexamined Patent Publication
No. 2005-210628
SUMMARY OF THE INVENTION
Problem to be Solved by the Invention
[0005] Recently, the semiconductor-mounting board for an imaging
device is required to have a reduction in thickness (reduction in
height). However, there is a disadvantage that when the
semiconductor-mounting board for an imaging device achieving a
reduction in thickness is a resin board, creases, wrinkles, or the
like can be easily generated at the time of handling thereof in
particular.
[0006] Then, it is considered that a frame-shaped metal
reinforcement portion is provided around an area on which the
semiconductor for imaging is mounted.
[0007] To form the metal reinforcement portion, first, the resin
board is laminated on a solid metal layer, and thereafter, the
central portion of the metal layer is removed by trimming
[0008] When the metal layer is a solid shape (before trimming),
deformation is prevented by a supporting force of the metal layer,
while in the resin board, a contractive force is generated caused
by a difference of a contraction rate between the resin board and
the metal layer. However, when the central portion is removed by
the above-described trimming, the supporting force of the metal
layer is reduced, and thus, the resin board sags (is deformed) by
the contractive force. Then, there is a disadvantage that the
subsequent handleability is reduced, and furthermore, the
semiconductor cannot be accurately mounted.
[0009] The present invention provides an imaging element-mounting
board that is capable of suppressing generation of creases and
wrinkles, suppressing deformation, and accurately mounting an
imaging element with excellent handleability.
MEANS FOR SOLVING THE PROBLEM
[0010] The present invention (1) includes an imaging
element-mounting board including a board area having a board
disposed and a plurality of reinforcement portions disposed around
the board area, wherein the plurality of reinforcement portions are
independent from each other.
[0011] In the imaging element-mounting board, the board area is
reinforced by the plurality of reinforcement portions, so that
generation of the creases and the wrinkles is reduced. The
plurality of reinforcement portions are independent from each
other, so that there is no reinforcement portion between the
plurality of reinforcement portions, and thus, the contractive
force generated in the board area can be released (dispersed).
Therefore, the deformation caused by the contractive force can be
suppressed. As a result, the imaging element-mounting board has
excellent handleability and can accurately mount the imaging
element thereon, while reducing the generation of the creases and
the wrinkles.
[0012] The present invention (2) includes the imaging
element-mounting board described in (1), wherein the plurality of
reinforcement portions include the reinforcement portions facing
each other with the board area sandwiched therebetween in a plane
direction perpendicular to a thickness direction.
[0013] In the imaging element-mounting board, the plurality of
reinforcement portions include the reinforcement portions facing
each other with the board area sandwiched therebetween in the plane
direction, so that the deformation caused by the contractive force
can be suppressed, while the generation of the creases and the
wrinkles at the time of handling thereof is suppressed.
[0014] The present invention (3) includes the imaging
element-mounting board described in (1) or (2), wherein the board
area is a plural board area in which the plurality of boards are
disposed in alignment.
[0015] In the imaging element-mounting board, the board area is a
plural board area in which the plurality of boards are disposed in
alignment in the plane direction perpendicular to the thickness
direction, so that the plurality of boards can be collectively
reinforced.
[0016] The present invention (4) includes the imaging
element-mounting board described in (3), wherein the plural board
area has a generally rectangular shape, and the plurality of
reinforcement portions are disposed corresponding to each of the
sides of the plural board area.
[0017] In the imaging element-mounting board, the plurality of
reinforcement portions are disposed corresponding to each of the
sides of the plural board area, so that the plurality of boards can
be efficiently reinforced.
[0018] The present invention (5) includes the imaging
element-mounting board described in (3) or (4) further including an
auxiliary reinforcement portion disposed at the inside of the
plural board area.
[0019] In the imaging element-mounting board, the plurality of
boards can be collectively reinforced by the reinforcement portion,
while the board at the inside of the plural board area is
reinforced by the auxiliary reinforcement portion.
[0020] The present invention (6) includes the imaging
element-mounting board described in (1) or (2), wherein the board
area is a singular board area in which the single number of board
is disposed.
[0021] In the imaging element-mounting board, the board area is the
singular board area in which the single number of board is disposed
in alignment, so that each board can be surely reinforced.
[0022] The present invention (7) includes the imaging
element-mounting board described in (6), wherein the singular board
area has a generally rectangular shape, and the plurality of
reinforcement portions are disposed corresponding to each of the
sides of the singular board area.
[0023] In the imaging element-mounting board, the plurality of
reinforcement portions are disposed corresponding to each of the
sides of the singular board area, so that each board can be
efficiently reinforced.
[0024] The present invention (8) includes the imaging
element-mounting board described in at least any one of (4), (5),
and (7), wherein each of the plurality of reinforcement portions
has a generally linear shape, the plurality of reinforcement
portions are disposed so that a phantom line passing each of the
plurality of reinforcement portions has an intersection point, and
the reinforcement portion is not formed in a portion corresponding
to the intersection point.
[0025] In the imaging element-mounting board, the reinforcement
portion is not formed in the portion corresponding to the
intersection point, so that the contractive force generated in the
board area can be released in at least two directions along at
least the two reinforcement portions corresponding to the
intersection point and having a generally linear shape.
[0026] The present invention (9) includes the imaging
element-mounting board described in any one of (1) to (8), wherein
a material for the plurality of reinforcement portions is a metal,
and the board area includes a resin film.
[0027] In the imaging element-mounting board, the material for the
plurality of reinforcement portions is the metal, and the board
area includes the resin film, so that a difference of a contraction
rate between the metal and the resin is large, and thus, the
above-described contractive force is easily generated.
[0028] As described above, however, the plurality of reinforcement
portions are independent from each other, so that the contractive
force can be released. As a result, the deformation caused by the
contractive force can be suppressed. Accordingly, the imaging
element-mounting board has excellent handleability, and the imaging
element can be accurately mounted thereon.
[0029] The present invention (10) includes the imaging
element-mounting board described in any one of (1) to (7), wherein
the board area has a thickness of 50 .mu.m or less.
[0030] In the imaging element-mounting board, the thickness of the
board area is thin of 50 .mu.m or less, so that a reduction in
thickness thereof can be achieved.
[0031] Meanwhile, in the thin board area, the contractive force is
easily generated. In the imaging element-mounting board, however,
as described above, the contractive force can be easily released.
Thus, the deformation caused by the contractive force can be
suppressed. As a result, the imaging element-mounting board has
excellent handleability, and the imaging element can be accurately
mounted thereon.
EFFECT OF THE INVENTION
[0032] The imaging element-mounting board of the present invention
can accurately mount the imaging element thereon, while reducing
the generation of the creases and the wrinkles, and having
excellent handleability.
BRIEF DESCRIPTION OF THE DRAWINGS
[0033] FIG. 1 shows a plan view of a long-length board including an
imaging element-mounting board that is a one embodiment of the
present invention.
[0034] FIG. 2 shows an enlarged plan view of a plural board area in
the imaging element-mounting board shown in FIG. 1.
[0035] FIG. 3 shows a cross-sectional view along an A-A line of the
imaging element-mounting board shown in FIG. 2.
[0036] FIG. 4 shows a plan view of a modified example of an imaging
element-mounting board of the present invention.
[0037] FIG. 5 shows a plan view of a modified example of an imaging
element-mounting board of the present invention.
[0038] FIG. 6 shows a plan view of a modified example of an imaging
element-mounting board of the present invention.
[0039] FIG. 7 shows a plan view of a modified example of an imaging
element-mounting board of the present invention.
[0040] FIG. 8 shows a plan view of a modified example of an imaging
element-mounting board of the present invention.
[0041] FIG. 9 shows a plan view of a modified example of a singular
board area in an imaging element-mounting board of the present
invention.
[0042] FIG. 10 shows a plan view of a modified example of a
singular board area in an imaging element-mounting board of the
present invention.
[0043] FIG. 11 shows a plan view of a modified example of a
singular board area in an imaging element-mounting board of the
present invention.
[0044] FIG. 12 shows a plan view of a modified example of an
imaging element-mounting board of the present invention.
DESCRIPTION OF EMBODIMENTS
[0045] As shown by an upper-left view of FIG. 1, and FIG. 2, an
imaging element-mounting board 1 has a flat plate shape extending
in a first direction perpendicular to a thickness direction, and to
be specific, has a predetermined thickness, and has a flat front
surface and a flat rear surface. The imaging element-mounting board
1 is obtained by cutting a long-length board 17 extending in the
first direction (having a long length) and having the
above-described imaging element-mounting boards 1 disposed in
alignment along the first direction and a second direction
(direction perpendicular to the thickness direction and the first
direction). The imaging element-mounting board 1 includes a
plurality of boards 30 that is mounted with one imaging element to
be described next. The first direction and the second direction
described above are included in a plane direction.
[0046] The imaging element-mounting board 1 is not an imaging
device (not shown), and is one component of the imaging device (not
shown), that is, a component for fabricating the imaging device
(not shown). The imaging element-mounting board 1 does not include
an imaging element (not shown), and is an industrially available
device whose component alone is circulated.
[0047] As shown by the upper-left view of FIG. 1, the imaging
element-mounting board 1 includes a plurality of plural board areas
3.
[0048] The plural board area 3 is an area in a generally
rectangular shape when viewed from the top, and in the one imaging
element-mounting board 1, the plurality of plural board areas 3, to
be specific, the total of four plural board areas 3 (=2.times.2) of
two rows along the first direction and two rows along the second
direction are disposed in alignment at spaced intervals to each
other in each of the first direction and the second direction.
[0049] Each of the plurality of plural board areas 3 is an area in
which the plurality of boards 30 are assembled.
[0050] The board 30 has a generally rectangular shape when viewed
from the top, and in the one plural board area 3, the plurality of
boards 30, to be specific, the total of six plural boards 30
(=2.times.3) of two rows along the first direction and three rows
along the second direction are disposed in alignment at spaced
intervals to each other in each of the first direction and the
second direction.
[0051] The plural board area 3 includes a plurality of board areas
2 that ensure (define) the above-described board 30.
[0052] As shown in FIG. 2, a mounting area 10 (dashed lines) is
defined in the central portion in the plane direction of the board
30. The mounting area 10 is an area in a generally rectangular
shape when viewed from the top that is mounted with the one imaging
element (not shown).
[0053] As shown in FIGS. 2 and 3, the board 30 includes an
insulating layer 5 and a terminal 7. The details of the insulating
layer 5 and the terminal 7 are described later.
[0054] An auxiliary reinforcement portion 18 is provided at the
inside of the plural board area 3 and the outside of the board area
2. The auxiliary reinforcement portion 18 consists of an auxiliary
reinforcement layer 19 that is embedded in the insulating layer 5.
The auxiliary reinforcement layer 19 is provided independently from
the terminal 7, and has a generally sheet shape extending in the
plane direction. The auxiliary reinforcement portion 18 has a
generally lattice shape when viewed from the top between the
plurality of board areas 2. The auxiliary reinforcement portion 18
assists reinforcement of the board 30 (the plural board area 3) by
a reinforcement portion 4.
[0055] The auxiliary reinforcement layer 19 is also disposed in the
entire area other than the reinforcement portion 4 to be described
later at the outside of the plural board area 3 in the imaging
element-mounting board 1. The details of a thickness, a material,
or the like of the auxiliary reinforcement layer 19 are described
later.
[0056] The imaging element-mounting board 1 includes the plurality
of reinforcement portions 4 disposed around each of the plurality
of plural board areas 3.
[0057] The reinforcement portion 4 is provided corresponding to
each of the sides of the plural board area 3. To be specific, the
four reinforcement portions 4 are provided corresponding to the
four sides of the one plural board area 3. The four reinforcement
portions 4 are disposed in opposed relation at minute spaced
intervals to the outside in the plane direction of the four sides
of the one plural board area 3. The four reinforcement portions 4
are independent from each other.
[0058] The four reinforcement portions 4 consist of a first
reinforcement portion 11 and a second reinforcement portion 12
facing each other in the first direction, and a third reinforcement
portion 13 and a fourth reinforcement portion 14 facing each other
in the second direction.
[0059] The first reinforcement portion 11 is disposed in opposed
relation at spaced intervals to one side in the first direction of
the one plural board area 3. The first reinforcement portion 11 has
a generally linear shape extending along the second direction. That
is, the first reinforcement portion 11 has a width W1 that is the
same over the second direction. Each of both end edges in the
second direction of the first reinforcement portion 11 is
overlapped with each of both end edges in the second direction of
the plural board area 3 when projected in the first direction.
[0060] The second reinforcement portion 12 is disposed in opposed
relation at spaced intervals to the other side in the first
direction of the one plural board area 3. The second reinforcement
portion 12 has a generally linear shape extending along the second
direction. That is, the second reinforcement portion 12 has the
same width W1 as the description above over the second direction.
Each of both end edges in the second direction of the second
reinforcement portion 12 is overlapped with each of both end edges
in the second direction of the plural board area 3 when projected
in the first direction.
[0061] In this manner, the first reinforcement portion 11 faces the
second reinforcement portion 12 in the first direction with the
plural board area 3 sandwiched therebetween. Each of both end edges
in the second direction of the first reinforcement portion 11 is
overlapped with each of both end edges in the second direction of
the second reinforcement portion 12 when projected in the first
direction.
[0062] The third reinforcement portion 13 is disposed in opposed
relation at spaced intervals to one side in the second direction of
the one plural board area 3. The third reinforcement portion 13 has
a generally linear shape extending along the first direction. That
is, the third reinforcement portion 13 has a width W2 that is the
same over the first direction. Each of both end edges in the first
direction of the third reinforcement portion 13 is overlapped with
each of both end edges in the first direction of the plural board
area 3 when projected in the second direction.
[0063] The fourth reinforcement portion 14 is disposed in opposed
relation at spaced intervals to the other side in the second
direction of the one plural board area 3. The fourth reinforcement
portion 14 has a generally linear shape extending along the first
direction. That is, the fourth reinforcement portion 14 has the
same width W2 as the description above over the first direction.
Each of both end edges in the first direction of the fourth
reinforcement portion 14 is overlapped with each of both end edges
in the first direction of the plural board area 3 when projected in
the second direction.
[0064] In this manner, the third reinforcement portion 13 faces the
fourth reinforcement portion 14 in the second direction with the
plural board area 3 sandwiched therebetween. Each of both end edges
in the first direction of the third reinforcement portion 13 is
overlapped with each of both end edges in the first direction of
the fourth reinforcement portion 14 when projected in the second
direction.
[0065] Meanwhile, the reinforcement portion 4 is not formed in a
portion corresponding to an intersection point IS (a defective
portion 20), while a phantom line passing each of the reinforcement
portions 4 that are next to each other is disposed so as to have
the intersection point IS.
[0066] To be specific, the reinforcement portion 4 is not formed in
a portion corresponding to an intersection point IS1 (a first
defective portion 21), while a phantom line passing each of the
first reinforcement portion 11 and the third reinforcement portion
13 is disposed so as to have the intersection point IS1.
[0067] Also, the reinforcement portion 4 is not formed in a portion
corresponding to an intersection point IS2 (a second defective
portion 22), while a phantom line passing each of the first
reinforcement portion 11 and the fourth reinforcement portion 14 is
disposed so as to have the intersection point IS2.
[0068] Furthermore, the reinforcement portion 4 is not formed in a
portion corresponding to an intersection point IS3 (a third
defective portion 23), while a phantom line passing each of the
second reinforcement portion 12 and the third reinforcement portion
13 is disposed so as to have the intersection point IS3.
[0069] Moreover, the reinforcement portion 4 is not formed in a
portion corresponding to an intersection point IS4 (a fourth
defective portion 24), while a phantom line passing each of the
second reinforcement portion 12 and the fourth reinforcement
portion 14 is disposed so as to have the intersection point
IS4.
[0070] In short, the four reinforcement portions 4 have a
discontinuous pattern that is discontinuous in a circumferential
direction in which only the four apex portions in a generally
rectangular frame shape when viewed from the top are not formed,
and a portion other than the four apex portions is formed. The four
apex portions correspond to the above-described four defective
portions 20 (the first defective portion 21, the second defective
portion 22, the third defective portion 23, and the fourth
defective portion 24), and the portion other than the four apex
portions corresponds to the four reinforcement portions 4.
[0071] A ratio (W1/L1) of the width W1 of each of the first
reinforcement portion 11 and the second reinforcement portion 12 to
a distance L1 between the first reinforcement portion 11 and the
second reinforcement portion 12 is, for example, 0.005 or more,
preferably 0.01 or more, and for example, 0.5 or less, preferably
0.2 or less. A ratio (W2/L2) of the width W2 of each of the third
reinforcement portion 13 and the fourth reinforcement portion 14 to
a distance L2 between the third reinforcement portion 13 and the
fourth reinforcement portion 14 is, for example, 0.005 or more,
preferably 0.01 or more, and for example, 0.5 or less, preferably
0.2 or less.
[0072] A ratio (L1/L3) of the distance L1 between the first
reinforcement portion 11 and the second reinforcement portion 12 to
a length L3 in the first direction of the plural board area 3 is,
for example, 1.001 or more, preferably 1.005 or more, and for
example, 1.2 or less, preferably 1.1 or less. A ratio (L2/L4) of
the distance L2 between the third reinforcement portion 13 and the
fourth reinforcement portion 14 to a length L4 in the second
direction of the plural board area 3 is, for example, 1.001 or
more, preferably 1.005 or more, and for example, 1.2 or less,
preferably 1.1 or less.
[0073] A ratio (L5/(L3+L4)) of the shortest distance L5 between the
first reinforcement portion 11 and the third reinforcement portion
13 to the total sum (L3+L4) of the length L3 in the first direction
and the length L4 in the second direction of the plural board area
3 is, for example, 0.005 or more, preferably 0.008 or more, and for
example, 0.5 or less, preferably 0.3 or less. A ratio (L6/(L3+L4))
of the shortest distance L6 between the second reinforcement
portion 12 and the third reinforcement portion 13 to the
above-described total sum (L3+L4), a ratio (L7/(L3+L4)) of the
shortest distance L7 between the second reinforcement portion 12
and the fourth reinforcement portion 14 to the above-described
total sum (L3+L4), and a ratio (L8/(L3+L4)) of the shortest
distance L8 between the first reinforcement portion 11 and the
fourth reinforcement portion 14 to the above-described total sum
(L3+L4) are the same as the above-described ratio (L5/(L3+L4)).
[0074] The reinforcement portion 4 consists of a reinforcement
layer 15. The details of the reinforcement layer 15 are described
next.
[0075] As shown in FIGS. 2 and 3, the imaging element-mounting
board 1 includes the insulating layer 5, the terminal 7, the
auxiliary reinforcement layer 19, and the reinforcement layer
15.
[0076] The insulating layer 5 has a sheet (film) shape, and
supports the terminal 7 so as to be insulated. The insulating layer
5 sequentially includes a base insulating layer 6 and a cover
insulating layer 8 toward one side in the thickness direction.
Examples of a material for the insulating layer 5 include resins
such as polyimide. That is, as the insulating layer 5, a resin
sheet (resin film) having flexibility is used. A thermal
contraction rate of the insulating layer 5 is represented as a
linear expansion coefficient, and is, for example, 50 ppm or less,
preferably 30 ppm or less, and for example, 3 ppm or more,
preferably 10 ppm or more. The insulating layer 5 has a thickness
of, for example, 2 .mu.m or more, preferably 10 .mu.m or more, and
for example, 50 .mu.m or less, preferably 20 .mu.m or less.
[0077] As shown in FIG. 2, the terminal 7 fills a through hole (not
shown) provided in the insulating layer 5. The plurality of
terminals 7 are disposed in alignment at the inside of the mounting
area 10. The terminal 7 is electrically connected to an external
terminal (not shown) via a wire that is not shown. The wire (not
shown) is embedded in the insulating layer 5. Examples of a
material for the terminal 7 and the wire (not shown) include
conductors such as copper. The terminal 7 and the wire (not shown)
have a thickness of, for example, 1 .mu.m or more, preferably 3
.mu.m or more, and for example, 15 .mu.m or less, preferably 10
.mu.m or less.
[0078] The auxiliary reinforcement layer 19 is embedded in the
insulating layer 5. To be specific, the auxiliary reinforcement
layer 19 is disposed on a one-side surface in the thickness
direction of the base insulating layer 6 so as to be covered by the
cover insulating layer 8. An other-side surface in the thickness
direction of the auxiliary reinforcement layer 19 is in contact
with the one-side surface in the thickness direction of the base
insulating layer 6. The one-side surface in the thickness direction
and both side surfaces in the plane direction of the auxiliary
reinforcement layer 19 are in contact with the cover insulating
layer 8.
[0079] Examples of a material for the auxiliary reinforcement layer
19 include materials having toughness. Examples thereof include
metal materials such as copper, silver, gold, nickel, and an alloy
thereof, and solder. Preferably, copper is used. When the material
for the auxiliary reinforcement layer 19 is copper, and when the
material for the terminal 7 and the wire (not shown) is copper, the
auxiliary reinforcement layer 19 can be formed simultaneously with
the forming of these.
[0080] The auxiliary reinforcement portion 18 assists the
reinforcement of the board 30 by the reinforcement portion 4, so
that the rigidity of the auxiliary reinforcement layer 19 is lower
than that of the reinforcement layer 15. To be specific, a ratio
(E2/E1) of a Young's modulus E2 at 25.degree. C. of the auxiliary
reinforcement layer 19 to a Young's modulus E1 at 25.degree. C. of
the reinforcement layer 15 is, for example, above 1, preferably 1.2
or more, more preferably 1.3 or more, and for example, 10 or
less.
[0081] The thickness of the auxiliary reinforcement layer 19 is the
same as that of the above-described wire (not shown), and is, for
example, 0.5 .mu.m or more, preferably 2 .mu.m or more, and for
example, 20 .mu.m or less, preferably 12 .mu.m or less, more
preferably 8 .mu.m or less.
[0082] The thickness of the plural board area 3 is calculated as
the maximum thickness of the plural board area 3, and to be
specific, corresponds to the total thickness of the insulating
layer 5 and the auxiliary reinforcement layer 19. To be specific,
the plural board area 3 has a thickness of, for example, 50 .mu.m
or less, preferably 40 .mu.m or less, more preferably 30 .mu.m or
less, and for example, 10 .mu.m or more.
[0083] When the above-described thickness is the above-described
upper limit or less, a reduction in thickness can be achieved.
Meanwhile, when the above-described thickness is the
above-described upper limit or less, a sag (deformation) in the
plural board area 3 (the board area 2) can be easily produced in a
producing step to be described later. However, the reinforcement
portion 4 is not formed in the above-described defective portion
20, so that the above-described generation of the sag (deformation)
can be suppressed.
[0084] The reinforcement layer 15 is disposed on the lower surface
of the insulating layer 5 in a pattern of forming the reinforcement
portion 4. To be more specific, the reinforcement layer 15 is in
contact with the other-side surface in the thickness direction of
the base insulating layer 6. Meanwhile, the other-side surface in
the thickness direction of the base insulating layer 6 is exposed
from the inside and the outside in the plane direction of the
reinforcement layer 15.
[0085] An example of a material for the reinforcement layer 15
includes a material having rigidity. Examples thereof include
metals such as stainless steel, 42-alloy, aluminum, and copper
alloy; resins; and ceramics. Preferably, a metal is used.
[0086] The thermal contraction rate of the reinforcement layer 15
is represented as the linear expansion coefficient, and is, for
example, 30 ppm or less, preferably 20 ppm or less, and for
example, 1 ppm or more, preferably 5 ppm or more.
[0087] The reinforcement layer 15 has a thickness of, for example,
5 .mu.m or more, preferably 10 .mu.m or more, and for example, 50
.mu.m or less, preferably 30 .mu.m or less. A ratio (thickness of
the reinforcement layer 15/thickness of the insulating layer 5) of
the thickness of the reinforcement layer 15 to that of the
insulating layer 5 is, for example, 0.3 or more, preferably 1 or
more, and for example, 10 or less, preferably 5 or less.
Furthermore, a ratio (thickness of the reinforcement layer
15/thickness of the auxiliary reinforcement layer 19) of the
thickness of the reinforcement layer 15 to that of the auxiliary
reinforcement layer 19 is, for example, 1 or more, preferably 2 or
more, and for example, 10 or less, preferably 5 or less.
[0088] Next, a method for producing the imaging element-mounting
board 1 is described. In the production of the imaging
element-mounting board 1, for example, a roll-to-roll method in
which the imaging element-mounting board 1 is conveyed in the first
direction (MD direction) is used.
[0089] First, in this method, a reinforcement plate 25 (ref:
phantom line of FIG. 3) for forming the reinforcement layer 15 is
prepared. The reinforcement plate 25 has the same properties as
those of the above-described reinforcement layer 15, and has a
long-length plate shape extending in the first direction. The
reinforcement plate 25 is a supporting plate that prevents the
deformation of the insulating layer 5.
[0090] Next, the base insulating layer 6 is formed on the entire
one-side surface in the thickness direction of the reinforcement
plate 25. For example, first, a photosensitive insulating
composition containing a photosensitive component and an insulator
is prepared, and subsequently, the photosensitive insulating
composition is applied to the one-side surface in the thickness
direction of the reinforcement plate 25 to be then dried as needed,
thereby forming a film. Next, the film is exposed to light via a
photomask and developed to be then heated after exposure to
light.
[0091] By the above-described heating after exposure to light, the
contractive force is generated between the reinforcement plate 25
and the base insulating layer 6 caused by the difference of the
thermal contraction rate of these. However, the reinforcement plate
25 is disposed on the entire other-side surface in the thickness
direction of the base insulating layer 6, so that the deformation
caused by the contractive force of the base insulating layer 6 can
be suppressed by the supporting force of the reinforcement plate
25.
[0092] Next, the terminal 7, the wire (not shown), the external
terminal (not shown), and the auxiliary reinforcement layer 19 are,
for example, formed on the one-side surface in the thickness
direction of the base insulating layer 6 by an additive method, a
subtractive method, or the like. In this manner, the terminal 7,
the external terminal (not shown), and the wire (not shown) are
formed, and the auxiliary reinforcement portion 18 that is
independent from these and consists of the auxiliary reinforcement
layer 19 is formed.
[0093] Next, the cover insulating layer 8 is formed on the one-side
surface in the thickness direction of the base insulating layer 6
so as to expose the one-side surface in the thickness direction of
the terminal 7 and the external terminal (not shown) and to cover
the wire (not shown). For example, first, the photosensitive
insulating composition containing the photosensitive component and
the insulator is prepared, and subsequently, the photosensitive
insulating composition is applied to the one-side surface in the
thickness direction of the reinforcement plate 25 so as to cover
the terminal 7, the wire (not shown), and the auxiliary
reinforcement portion 18 to be then dried as needed, thereby
forming the film. Next, the film is exposed to light via the
photomask having a pattern corresponding to the terminal 7 and the
external terminal (not shown) and developed to be then heated after
exposure to light.
[0094] By the above-described heating after exposure to light, the
contractive force is generated between the reinforcement plate 25
and the cover insulating layer 8 caused by the difference of the
thermal contraction rate of these. However, the reinforcement plate
25 is disposed on the entire other-side surface in the thickness
direction of the base insulating layer 6, so that the deformation
of the cover insulating layer 8 is suppressed by being supported by
the reinforcement plate 25 via the base insulating layer 6.
[0095] Thereafter, the reinforcement plate 25 is trimmed, so that
the reinforcement portion 4 consisting of the reinforcement layer
15 is formed. The trimming of the reinforcement plate 25 is not
particularly limited, and examples thereof include etching such as
wet etching and dry etching, and laser processing. Preferably,
etching is used, more preferably, wet etching using an etching
resist is used.
[0096] By the trimming of the reinforcement plate 25, the
supporting of the insulating layer 5 in the plural board area 3 is
removed (the supporting is lost). Thus, the plural board area 3
(the insulating layer 5 therein) easily sags (is easily deformed)
caused by the contractive force.
[0097] However, the above-described deformation is suppressed by
the plurality of reinforcement portions 4 that are independent from
each other.
[0098] In this manner, the long-length board 17 in which the
plurality of imaging element-mounting boards 1 are disposed along
the first direction (MD direction) is obtained.
[0099] Thereafter, as shown by one-dot chain lines of FIG. 1, the
long-length board 17 is cut along the first direction (MD
direction) and the second direction (TD direction) by dicing or the
like, so that the imaging element-mounting boards 1 are
singulated.
[0100] In this manner, as referred to the upper-left view of FIG.
1, the imaging element-mounting boards 1 each including the
plurality of plural board areas 3 are obtained.
[0101] Thereafter, the imaging element (not shown) is mounted on
each of the plurality of board areas 2 (the mounting area 10) in
each of the plurality of plural board areas 3.
[0102] Thereafter, furthermore, the imaging element-mounting boards
1 that are mounted with the plurality of imaging elements are cut
along the first direction and the second direction by the dicing or
the like so that the imaging elements and the board areas 2 are
singulated.
[0103] In the imaging element-mounting board 1, the plural board
area 3 including the board area 2 is reinforced by the plurality of
reinforcement portions 4, so that the generation of the creases and
the wrinkles in the plural board area 3 can be reduced. At the same
time, the plurality of reinforcement portions 4 are independent
from each other, so that there is no reinforcement portion 4
between the plurality of reinforcement portions 4 (the defective
portion 20). Thus, the contractive force generated in the plural
board area 3 can be released (dispersed) from the defective portion
20.
[0104] Thus, the deformation caused by the contractive force in the
plural board area 3 can be suppressed.
[0105] As a result, the imaging element-mounting board 1 has
excellent handleability and can accurately mount the imaging
element (not shown) thereon, while reducing the generation of the
creases and the wrinkles in the plural board area 3.
[0106] In the imaging element-mounting board 1, the plurality of
reinforcement portions 4 include the reinforcement portions 4
facing each other with the board area 1 sandwiched therebetween in
the plane direction, so that the deformation caused by the
contractive force can be suppressed, while the generation of the
creases and the wrinkles at the time of handling of the plural
board area 3 is suppressed.
[0107] In the imaging element-mounting board 1, the board area 2 is
the plural board area 3 in which the plurality of boards 30 are
disposed in alignment in the plane direction, so that the plurality
of boards 30 can be collectively reinforced.
[0108] Furthermore, in the imaging element-mounting board 1, the
plurality of reinforcement portions 4 are disposed corresponding to
each of the sides of the plural board area 3, so that the plurality
of boards 30 can be efficiently reinforced.
[0109] In the imaging element-mounting board 1, the plurality of
boards 30 can be collectively reinforced by the reinforcement
portion 4, while the board 30 at the inside of the plural board
area 3 is reinforced by the auxiliary reinforcement portion 18.
[0110] In the imaging element-mounting board 1, the reinforcement
portion 4 is not formed in the defective portion 20 corresponding
to the intersection point IS, so that the contractive force
generated in the plural board area 3 can be released in the two
directions, that is, both of the first direction and the second
direction along the two reinforcement portions 4 corresponding to
the intersection point IS and having a generally linear shape.
[0111] To be specific, the contractive force can be released in the
two directions along the first reinforcement portion 11 and the
third reinforcement portion 13 corresponding to the intersection
point IS1. Also, the contractive force can be released in the two
directions along the first reinforcement portion 11 and the fourth
reinforcement portion 14 corresponding to the intersection point
IS2. Also, the contractive force can be released in the two
directions along the second reinforcement portion 12 and the third
reinforcement portion 13 corresponding to the intersection point
IS3. Furthermore, the contractive force can be released in the two
directions along the second reinforcement portion 12 and the fourth
reinforcement portion 14 corresponding to the intersection point
IS4.
[0112] In the imaging element-mounting board 1, the material for
the plurality of reinforcement portions 4 is the metal, and when
the board area 2 includes the resin film, the difference of the
contraction rate (thermal expansion coefficient or the like)
between the metal and the resin is large, and thus, the
above-described contractive force is easily generated.
[0113] As described above, however, the plurality of reinforcement
portions 4 are independent from each other, so that the contractive
force can be released. As a result, the deformation caused by the
contractive force can be suppressed. Accordingly, the imaging
element-mounting board 1 has excellent handleability, and the
imaging element can be accurately mounted thereon.
[0114] In the imaging element-mounting board 1, when the thickness
of the plural board area 3 (the board area 2) is thin of 50 .mu.m
or less, a reduction in thickness thereof can be achieved.
[0115] Meanwhile, in the thin plural board area 3, the
above-described contractive force is easily generated. As described
above, however, the reinforcement portion 4 is not formed in the
defective portion 20, so that the contractive force can be
released. Thus, the deformation caused by the contractive force can
be suppressed. As a result, the imaging element-mounting board 1
has excellent handleability, and the imaging element (not shown)
can be accurately mounted thereon.
Modified Examples
[0116] In modified examples, the same reference numerals are
provided for members and steps corresponding to each of those in
the one embodiment, and their detailed description is omitted.
Furthermore, the modified examples can achieve the same function
and effect as that of the one embodiment unless otherwise
specified.
[0117] The imaging element-mounting board 1 can be also constituted
(produced in advance) as one sheet (plate) produced by a single
wafer processing method instead of the long-length board 17
produced by a roll-to-roll method.
[0118] The mounting order of the imaging element is not limited to
the description above, and for example, the imaging element can be
also mounted on the long-length board 17 before the dicing.
Furthermore, the imaging element can be also mounted on each of the
plurality of boards 30 obtained by singulating the plurality of
plural board areas 3.
[0119] The reinforcement portion 4 may be disposed corresponding to
each of the sides of the plural board area 3, and the plurality of
reinforcement portions 4 may be, for example, provided in each of
the sides.
[0120] As shown in FIG. 4, for example, the plurality of (for
example, three) first reinforcement portions 11 are provided with
respect to the side at one side in the first direction of the
plural board area 3. The plurality of first reinforcement portions
11 are disposed at spaced intervals in the second direction. Each
of the plurality of first reinforcement portions 11 is positioned
on the same phantom line. Each of the plurality of first
reinforcement portions 11 is provided corresponding to the
plurality of (for example, three) boards 30 disposed at one side in
the first direction in the plural board area 3. That is, each of
the plurality of first reinforcement portions 11 is provided in
one-to-one correspondence with each of the plurality of boards 30
disposed at one side in the first direction of the plural board
area 3.
[0121] The plurality of (for example, three) second reinforcement
portions 12 are provided with respect to the side at the other side
in the first direction of the plural board area 3. The plurality of
second reinforcement portions 12 are disposed at spaced intervals
in the second direction. Each of the plurality of second
reinforcement portions 12 is positioned on the same phantom line.
Each of the plurality of second reinforcement portions 12 is
provided corresponding to the plurality of (for example, three)
boards 30 disposed at the other side in the first direction in the
plural board area 3. That is, each of the plurality of second
reinforcement portions 12 is provided in one-to-one correspondence
with each of the plurality of boards 30 disposed at the other side
in the first direction of the plural board area 3.
[0122] The plurality of (for example, two) third reinforcement
portions 13 are provided with respect to the side at one side in
the second direction of the plural board area 3. The plurality of
third reinforcement portions 13 are disposed at spaced intervals in
the first direction. Each of the plurality of third reinforcement
portions 13 is positioned on the same phantom line. Each of the
plurality of third reinforcement portions 13 is provided
corresponding to the plurality of (for example, two) boards 30
disposed at one side in the second direction in the plural board
area 3. That is, each of the plurality of third reinforcement
portions 13 is provided in one-to-one correspondence with each of
the plurality of boards 30 disposed at one side in the second
direction of the plural board area 3.
[0123] The plurality of (for example, two) fourth reinforcement
portions 14 are provided with respect to the side at the other side
in the second direction of the plural board area 3. The plurality
of fourth reinforcement portions 14 are disposed at spaced
intervals in the first direction. Each of the plurality of fourth
reinforcement portions 14 is positioned on the same phantom line.
Each of the plurality of fourth reinforcement portions 14 is
provided corresponding to the plurality of (for example, two)
boards 30 disposed at the other side in the second direction in the
plural board area 3. That is, each of the plurality of fourth
reinforcement portions 14 is provided in one-to-one correspondence
with each of the plurality of boards 30 disposed at the other side
in the second direction of the plural board area 3.
[0124] In the one embodiment, as shown in FIG. 2, generally the
frame shape for constituting the reinforcement portion 4 is a
generally rectangular shape. However, though not shown, the
plurality of reinforcement portions 4 can also have a pattern in
which only the apex portions in a frame shape of polygonal shape
(for example, triangular shape, hexagonal shape, or the like)
excluding the rectangular shape are not formed.
[0125] As shown in FIG. 5, the imaging element-mounting board 1 can
also further include a plurality of first inner-side reinforcement
portions 16 that are disposed at the inside of the plural board
area 3. The plurality of first inner-side reinforcement portions 16
are disposed so as to be sandwiched (sandwiched or interlaid)
between the plurality of board areas 2 that are next to each other
in the first direction and the second direction. The first
inner-side reinforcement portion 16 has the same shape when viewed
from the top as that of the reinforcement portion 4. A material and
a layer structure of the first inner-side reinforcement portion 16
are the same as those of the reinforcement portion 4.
[0126] In this manner, the four first inner-side reinforcement
portions 16 and the reinforcement portions 4 are disposed
corresponding to the four sides of the one board area 2.
[0127] As shown in FIG. 6, the defective portion 20 can be also
provided corresponding to only the central portion of each of the
four sides of the plural board area 3 instead of the intersection
point IS. That is, in the intersection point IS, the reinforcement
portion 4 is provided instead of the defective portion 20.
[0128] In the modified example, each of the plurality of
reinforcement portions 4 has an L-shape when viewed from the top.
To be specific, each of the plurality of reinforcement portions 4
includes a first linear portion 31 extending along the first
direction, a second linear portion 32 extending along the second
direction, and a connecting portion 33 that connects the first
linear portion 31 to the second linear portion 32. The connecting
portion 33 is disposed on the intersection point IS between the
first linear portion 31 and the second linear portion 32.
[0129] The defective portion 20 is independently disposed in a
portion of the two first linear portions 31 facing each other in
the first direction, and in a portion of the two second linear
portions 32 facing each other in the second direction. Each of the
plurality of defective portions 20 divides the plurality of (four)
reinforcement portions 4.
[0130] Preferably, as shown in the one embodiment of FIG. 2, the
defective portion 20 is provided on the intersection point IS. As
shown in FIG. 6, when the defective portion 20 is provided in a
portion of the two first linear portions 31 facing each other, and
when the reinforcement portion 4 (the connecting portion 33) is
provided in the intersection point IS, in the defective portion 20
in a portion of the two first linear portions 31, the contractive
force can be released by only the reinforcement portion 4 extending
along the first direction. When the defective portion 20 is
provided in a portion of the two second linear portions 32 facing
each other, in the defective portion 20 in a portion of the two
second linear portions 32, the contractive force can be released by
only the reinforcement portion 4 extending along the second
direction.
[0131] On the other hand, as shown in FIG. 2, when the
reinforcement portion 4 does not have the connecting portion 33 and
the defective portion 20 is provided on the intersection point IS,
the contractive force generated in the plural board area 3 can be
released along the two reinforcement portions 4 corresponding to
the two phantom lines constituting the intersection point IS in the
one intersection point IS.
[0132] As shown in FIGS. 7 and 8, only the two reinforcement
portions 4 may be also provided corresponding to the one plural
board area 3.
[0133] As shown in FIG. 7, for example, the reinforcement portion 4
does not include the first reinforcement portion 11 and the third
reinforcement portion 13, and consists of only the second
reinforcement portion 12 and the fourth reinforcement portion 14.
Alternatively, though not shown, oppositely, that is, the
reinforcement portion 4 does not include the second reinforcement
portion 12 and the fourth reinforcement portion 14, and can consist
of only the first reinforcement portion 11 and the third
reinforcement portion 13. In any modified example, the two
reinforcement portions 4 are disposed in opposed relation to each
other with the plural board area 3 sandwiched therebetween without
constituting the intersection point IS.
[0134] As shown in FIG. 8, the reinforcement portion 4 does not
include the second reinforcement portion 12 and the third
reinforcement portion 13, and can consist of only the first
reinforcement portion 11 and the fourth reinforcement portion 14.
Furthermore, though not shown, the reinforcement portion 4 can
consist of only the first reinforcement portion 11 and the third
reinforcement portion 13, can consist of only the second
reinforcement portion 12 and the fourth reinforcement portion 14,
and furthermore, can consist of only the second reinforcement
portion 12 and the third reinforcement portion 13. In any modified
example, only the one intersection point IS is formed, and the
reinforcement portion 4 is not formed in the defective portion 20
corresponding to the intersection point IS.
[0135] Of the modified examples of FIGS. 7 and 8, preferably, as
shown in FIG. 7, the two reinforcement portions 4 are disposed in
opposed relation to each other with the plural board area 3
sandwiched therebetween. When the two reinforcement portions 4 are
disposed in opposed relation to each other with the plural board
area 3 sandwiched therebetween, the deformation caused by the
contractive force can be suppressed, while the generation of the
creases and the wrinkles at the time of handling of the plural
board area 3 is suppressed.
[0136] As shown in FIG. 9, the board area 2 is a singular board
area 35 in a generally rectangular shape when viewed from the top
in which the single number of (one) board 30 is disposed. The
reinforcement portion 4 is disposed corresponding to each of the
sides of the singular board area 35. To be specific, the four
reinforcement portions 4 are disposed corresponding to the four
sides of the one singular board area 35.
[0137] As shown in FIG. 10, for example, the two reinforcement
portions 4 are disposed with the one board area 2 sandwiched
therebetween.
[0138] As shown in FIG. 11, the two reinforcement portions 4 are
disposed corresponding to the two sides constituting the one apex
in the one board area 2.
[0139] According to the modified examples of FIGS. 9 to 11, the
board area 2 is the singular board area 35 in which the single
number of board 30 is disposed in alignment, so that each board 30
can be surely reinforced.
[0140] Of the modified examples of FIGS. 10 and 11, preferably, as
shown in FIG. 10, the two reinforcement portions 4 are disposed in
opposed relation to each other with the board area 2 sandwiched
therebetween. When the two reinforcement portions 4 are disposed in
opposed relation to each other with the plural board area 3
sandwiched therebetween, the deformation caused by the contractive
force can be suppressed, while the generation of the creases and
the wrinkles at the time of handling of the plural board area 3 is
suppressed.
[0141] The modified example of FIG. 9 is more preferably than the
modified examples of FIGS. 10 and 11.
[0142] In the imaging element-mounting board 1 of the modified
example of FIG. 9, the plurality of reinforcement portions 4 are
disposed corresponding to each of the sides of the singular board
area 35, so that each board 30 can be efficiently reinforced.
[0143] In the one embodiment, each of the plurality of
reinforcement portions 4 has the width W that is the same in the
direction in which the reinforcement portion 4 extends. However, as
shown in FIG. 12, the reinforcement portion 4 can include a
narrow-width portion 41 and a wide-width portion 42. In this case,
the width W of the plurality of reinforcement portions 4 is defined
as an average value of the width of the narrow-width portion 41 and
the wide-width portion 42, and the above-described ratio (W/L or
the like) is calculated.
[0144] The imaging element-mounting board 1 has a second inner-side
reinforcement portion 26 that is disposed at the inside of the
board area 2. The four second inner-side reinforcement portions 26
are disposed at the outside of the four sides of the mounting area
10 at the inside of the one board area 2. The second inner-side
reinforcement portion 26 has the same shape when viewed from the
top as that of the reinforcement portion 4, and the material and
the layer structure thereof are the same as those of the
reinforcement portion 4.
[0145] Furthermore, the imaging element-mounting board 1 can also
include a third reinforcement layer 27 provided around a through
hole 28 provided corresponding to the one plural board area 3.
[0146] The through hole 28 has a generally circular shape when
viewed from the top passing through the insulating layer 5 in the
thickness direction. The through hole 28, for example, functions as
an alignment mark (positioning mark used for mounting of the
imaging element).
[0147] The third reinforcement layer 27 has a generally circular
ring shape when viewed from the top. The material and the layer
structure of the third reinforcement layer 27 are the same as those
of the reinforcement portion 4. The third reinforcement layer 27
reinforces the insulating layer 5 around the through hole 28.
[0148] While the illustrative embodiments of the present invention
are provided in the above description, such is for illustrative
purpose only and it is not to be construed as limiting the scope of
the present invention. Modification and variation of the present
invention that will be obvious to those skilled in the art is to be
covered by the following claims.
Industrial Applicability
[0149] The imaging element-mounting board of the present invention
is mounted with an imaging element.
Description of Reference Numerals
[0150] 1 Imaging element-mounting board [0151] 2 Board area [0152]
3 Plural board area [0153] 4 Reinforcement portion [0154] 18
Auxiliary reinforcement portion [0155] 30 Board [0156] 35 Singular
board area [0157] IS Intersection point
* * * * *